Hi. I may be late to reply but i'm in a weaving mood so here we are.
The thing is that the technique looks complicated due to the fact that there is 100 something and that number alone is scary. But. Actually several buts.
But number 1 - the technique is OLD. Meaning - while being somewhat tedious just like any other textile craft, it has been used and learned for a long long time and there's plenty of resources (check out links above or any youtube video explaining the process) of varying difficulty from complicated af to easy peasy lemon squeezy with closed eyes
But number 2 - there is only one core principle/step you need to understand and that is when some threads go from up to down or from down to up (aka when they cross), you need another thread going in between so they won't simply snap back again. That's it. That's the basic principle behind every weaving ever. What card weaving does compared to standard weave is that instead of a single thread going up and down in the single row, you get 2 or 3 or 4 or 6 or whatever number of threads your pattern calls for in the same row
But number 3 - the number of rows = number of cards. Simple as that. Cards turn around to make a cord like when you are twisting 2 or 4 or whatever numbers of threads to make a rope. If some of those threads have different colours, you get a repeating pattern.
But number 4 - card orientation or S/Z orientation or whatever other fancy name for the twisting direction simply means that if you turn all your card in the same way at the same time, which one of them will make the twisted rope in this / angle and which one will do that in this \ angle. That's it. That's the whole mystery between S/Z threading.
But number 5 - you can start with as little as 4 cards to make a custom set of shoe laces or a key strap or whatever and call yourself a weaver. Because you did that. And it was nice. And it was easy. You just turn and thread and turn and thread and then you keep repeating this while watching a movie or something. There's no need for the math finals level of concentration here.
But number 5 - no one, literally NO ONE starts with a pattern like this
No. Everybody starts with something like this
Keep it simple, keep it easy, make 10cm and be done if you want to. It's perfectly fine.
But number 6 - you don't need any fancy items for starting. No hooks, no needles, no loom, no anything. If you have 2 balls of yarn in different color or some remains of your old cross stitch project or whatever and some card-like stuff you won't be sad for making holes in it, you are all set. Back side of the sketch pad is good. Poker cards cut to squares are good. A sturdy enough sheet of plastic is also good. You remember that old pexeso pairs stack you didn't touch since you were 9? Guess what!
My point is that if this looks like something you may be interested in, then you can absolutely try doing it for literally zero cost other than your time.